CN1069353C - Polyester fiber and its composite fiber - Google Patents

Abstract

A fiber or filament having copolymerized therein from 2 to 20 mole percent of a compound having a specific structure, the compound having one to two ester-forming functional groups. The polyester fiber or filament has low birefringence and excellent dyeability and deep color development. The polyester fiber or filament has not only high shrinkage but also high shrinkage stress when drawn under selected conditions, and also has excellent light fastness, so that it can be used to replace conventional high shrinkage fibers.

Description

Polyester fiber and its composite fiber

technical field

The present invention relates to polyester fibers having improved properties in terms of dyeability, deep dyeability and light fastness. The present invention further relates to a composite fiber comprising polyester as a component of the above-mentioned polyester fiber, a mixed filament yarn containing filaments of different shrinkability or sheath-core false twisted yarn comprising polyester filament as a component , and blended yarns comprising the aforementioned polyester staple fiber components.

Background technique

Polyester fibers represented by polyethylene terephthalate fibers are widely used because of their superior performance. However, such fibers, compared with natural fibers such as wool and silk, and semi-synthetic fibers such as viscose rayon and acetate, have deficiencies in dyeing vividness, depth of color, especially deep black shades, and color development. place.

The existence of these defects is generally due to: the polyester fiber dyeing system uses disperse dyes, which often bring insufficient sharpness to the dyed article; at the same time, the polyester fiber has a higher density than other fibers along the direction perpendicular to the fiber axis. A refractive index of 1.7, which increases the light reflectivity of the fiber surface, thereby increasing the intensity of reflecting and scattering white light from the surface of the fabric containing polyester fibers.

In order to remedy these deficiencies, many proposals have been made to provide dyeing sites for bright dyes such as cationic dyes and acid dyes into polyester fibers. Although these modifications have improved the color brilliance of dyed fabrics, due to the high refractive index of the fibers, no substantial results have been achieved in terms of reducing white reflection and scattering, and improving color depth.

Japanese Patent Publication No. 2-42938 suggests that a low-refractive index compound be coated on the surface of polyester fiber to obtain dark dyeability. The publication exemplifies such complex organofluorine and organosilicon compounds.

Japanese Patent Publication No. 62-20304 and No. 62-28229 propose a method, which includes generating fine convex and concave points with undulating pitches smaller than the wavelength of light on the surface of polyester fibers to suppress reflection and scattering of light on the fiber surface.

However, since the fiber is coated with a low-refractive index compound, the coated film has poor dry-cleaning fastness. Furthermore, such coated fibers, even if they do achieve dark dyeability, produce dyed articles with new disadvantages of poor hand, poor color fastness and light fastness.

The fibers with extremely fine roughened surfaces obtained by the above method are damaged during post-processing, thereby reducing the effect of the fiber surface on suppressing reflection and scattering light. In addition, cloth woven from such fibers tends to exhibit an undesirable appearance due to wear and tear when worn.

In addition, one of the modified varieties of polyester fiber is high-shrinkage fiber, which is suitable for the following purposes: (1) mixed with low-shrinkage fiber, and the resulting fabric is heat-treated to obtain (2) Coarse high-shrinkage fibers are blended with thin low-shrinkage fibers, and the woven fabric is heat-treated to cause fiber length differences, so that the thin fibers protruding from the surface of the fabric produce a soft surface feel, while the sandwich The thick fibers inside the fabric produce good HARI (anti-drape stiffness) and KOSHI (stiffness); (3) high-shrinkage fibers are used as ground yarns for terry knitted or terry woven fabrics, thereby improving the quality of terry or fluff. Density; (4) High-shrinkage polymers are used as a component of composite fibers to make them potentially shrinkable fibers; (5) High-shrinkage fibers can be used in integral molding or three-dimensional molding.

High-shrinkage fibers have traditionally been prepared by modifying the acidic component of the polyester by polymerizing isophthalic acid with terephthalic acid during the polymerization of the raw polyester. This method was considered because this method of modifying the acidic component is the most convenient in achieving separation and recovery of the glycol component in the polymerization process. It is this method of modifying the acidic component which requires a high copolymerization ratio, which has the disadvantage of impairing the excellent properties inherent in polyester.

In the same case, not only the modification of the acid component but also the modification of the diol component has been practiced in recent years. Among the products obtained by the above method, the most common polyesters are polyesters copolymerized with an addition product of bisphenol A and alkylene oxide, and isophthalic acid and bisphenol A-alkylene oxide adducts Copolymerized polyester. These polyesters have a smaller copolymerization ratio and exhibit higher shrinkability than polyesters modified only with the acid component. Therefore, this method is effective in obtaining high shrinkage rate and high shrinkage stress while maintaining the inherent excellent properties of polyester.

However, polyesters in which bisphenol A-alkylene oxide adducts have been copolymerized suffer from extremely poor light fastness and color fastness.

Another method of obtaining high-shrinkage polyester fibers involves thermally drawing polyester fibers at low temperatures, thereby reducing the crystallinity of the polyester. Although this method does produce high-shrinkage polyester fibers, the fibers have low thermal shrinkage stress due to the stress reduction during drying and heating. As a result, woven and knitted fabrics made from mixed filament yarns combining low shrinkage fibers with such high shrinkage fibers are unlikely to exhibit high shrinkage effects.

The present inventors have made intensive studies to produce fibers having excellent dyeability and deep color dyeability, as well as high shrinkage and shrinkage stress. It has been found that polyesters copolymerized with certain amounts of compounds of specific chemical structure can produce fibers having sufficient dyeability, deep dyeability and shrinkage properties.

Polyesters co-polymerized with compounds of specific chemical structure in proportions of 50-100 mole percent are disclosed in U.S. Defense Bulletin No. T 896033, but such polyesters are difficult to convert into fibers.

The present invention is based on the discovery that copolyesters polymerized with specific amounts of compounds having a specific chemical structure can be converted into fibers having not only sufficient dyeability, deep dyeability, high shrinkage and shrinkage Stress characteristics, but also has excellent light fastness and color fastness.

An object of the present invention is to provide a polyester fiber having not only excellent dyeability, deep color dyeability, high shrinkage and shrinkage stress characteristics, but also excellent light fastness and color fastness.

Another object of the present invention is to provide a mixed filament yarn or a sheath-core false twist yarn comprising such a polyester fiber.

A further object of the present invention is to provide a blended yarn comprising, as a component, short fibers including polyester constituting the above-mentioned polyester fiber.

Still another object of the present invention is to provide a conjugate fiber comprising polyester as a component constituting the polyester fiber.

Summary of the invention

其中R₁到R₁₀中每一个代表选自成酯官能团、氢原子和烷基；R₁到R₁₀中的一个或两个是成酯官能团：X是0或1：y是满足下列条件的整数；The present invention provides a polyester fiber (hereinafter referred to as "PES fiber (II)") made of polyester (hereinafter referred to as PES (I)) containing 2-20 mole % as a copolymerization component The compound represented by the following structural formula (1):

Wherein each of R ₁ to R ₁₀ represents a group selected from ester-forming functional groups, hydrogen atoms and alkyl groups; one or two of R ₁ to R ₁₀ are ester-forming functional groups: X is 0 or 1: y meets the following conditions integer;

      1≤x+y≤3

The present invention further provides a composite fiber comprising PES(I).

The present invention further provides a filament yarn mixed with filaments of different shrinkage properties including the PES fiber (II).

The present invention further provides a sheath-core false twisted yarn comprising PES fibers (II).

The present invention still further provides a blended yarn comprising short fibers made of PES(I).

Best Mode for Carrying Out the Invention

Examples of the ester-forming functional group used in the compound represented by the formula (1) and contained in PES (I) constituting the PES fiber (II) are hydroxyl, hydroxyalkyl, carboxyl and ester-forming derivatives thereof. Although there is no limitation on the type of alkyl group constituting the hydroxyalkyl group, they are preferably alkyl groups having 1 to 4 carbon atoms, such as hydroxymethyl, hydroxyethyl, hydroxypropyl and hydroxybutyl, including branched alkyl. Examples of preferred carboxyl ester-forming derivatives are carboxyalkyl groups, the alkyl group of which contains 1 to 4 carbon atoms, such as carboxymethyl, carboxyethyl, carboxypropyl and carboxybutyl.

It is essential that such compounds should contain 1 or 2 ester-forming functional groups. This compound preferably contains two of the above-mentioned functional groups because it is desired to be copolymerized into the polyester molecular chain from the standpoint of high shrinkage characteristics of the obtained polyester fiber and its own high polymerization reactivity. These two functional groups can be either the same or different.

In this compound, the carbon atom not bonded to the ester-forming functional group is bonded to a hydrogen atom or an alkyl group, preferably a hydrogen atom, which does not hinder the polymerization reactivity. Examples of preferred alkyl groups are those having 1 to 5 carbon atoms, such as methyl, ethyl, propyl, butyl and pentyl, which may be branched.

Examples of compounds useful in the present invention are: norbornane-2,3-dimethanol, norbornane-2,3-diethanol, norbornane-2,3-dicarboxylic acid, norbornane-2, 3-dicarboxylate dimethyl ester, norbornane-2,3-dicarboxylate diethyl ester, perhydrogenated dimethylene naphthalene dimethanol, perhydrogenated dimethylene naphthalene diethanol, perhydrogenated dimethylene Naphthalene dicarboxylic acid, Dimethyl perhydrogenated dimethylene naphthalene dicarboxylate, Tricyclodecane dimethanol, Tricyclodecane diethanol, Tricyclodecane dicarboxylate, Tricyclodecane dicarboxylate dimethyl esters and diethyl tricyclodecane dicarboxylate. These compounds may contain alkyl or other substituents such as a sulfonyl group bonded not to an ester function but to a carbon atom. Preferred among the above-mentioned compounds are: norbornane-2,3-dimethanol, norbornane-2,3-dicarboxylic acid, norbornane-2,3-dicarboxylic acid dimethyl ester, perhydrogenated dimethicone Methylnaphthalene dimethanol, perhydrogenated dimethylene naphthalene dicarboxylic acid, perhydrogenated dimethylene naphthalene dicarboxylate dimethyl ester, tricyclodecane dimethanol, tricyclodecane diethanol, tricyclodecane dimethanol Carboxylic acid and dimethyl tricyclodecane dicarboxylate, both of which impart good polymerization reactivity, spinnability, fiber strength and shrinkage characteristics. Furthermore, from the viewpoint of polymerization reactivity, it is preferable to use norbornane-2,3-dimethanol, norbornane-2,3-dicarboxylic acid, norbornane-2,3-dicarboxylic acid dimethyl ester, perhydrogenated Dimethyl naphthalene dimethanol, perhydrogenated dimethylene naphthalene dicarboxylate, and dimethyl perhydrogenated dimethylene naphthalene dicarboxylate, all of which have two ester-forming functional groups at the transfer position.

The polyesters used in the present invention have a main dicarboxylic acid component of terephthalic acid and a main dicarboxylic acid component of at least one alkylene glycol selected from ethylene glycol, propylene glycol and 1,4-butanediol. Alcohol ingredients. The polyester may be further copolymerized with a third component other than the compound represented by the formula (1), provided that the object of the present invention is not hindered.

Examples of the third component are: aromatic dicarboxylic acids such as isophthalic acid, phthalic acid, naphthalene dicarboxylic acid, biphenyl dicarboxylic acid, 4,4'-biphenyl ether dicarboxylic acid, 4, 4'-diphenylmethane dicarboxylic acid, 4,4'-diphenylsulfone dicarboxylic acid, 4,4'-diphenylisopropylidene dicarboxylic acid, 1,2-diphenoxyethane- 4', 4" dicarboxylic acid, anthracene dicarboxylic acid, 2,5-pyridine dicarboxylic acid, diphenoxyketone dicarboxylic acid, 5-sodium sulfoisophthalate, dimethyl-5-sulfoisophthalate Sodium phthalate and 5-tetrabutylphosphonium sulfoisophthalic acid; aliphatic dicarboxylic acids, such as malonic, succinic, adipic, azelaic and sebacic acids; alicyclic dicarboxylic acids, For example, decalin dicarboxylic acid and cyclohexanedicarboxylic acid; hydroxycarboxylic acids, such as beta-hydroxyethoxybenzoic acid, p-hydroxybenzoic acid, hydroxypropionic acid and hydroxyacrylic acid; carboxylic acids derived from the above-mentioned ester-forming derivatives , such as aliphatic lactones, such as ε-caprolactone; aliphatic diols, such as 1,6-hexanediol, neopentyl glycol, diethylene glycol and polyethylene glycol; aromatic diols, such as hydroquinone, Catechol, naphthalenediol, resorcinol, bisphenol A-ethylene oxide adduct, bisphenol S and bisphenol S-ethylene oxide adduct; and alicyclic diols such as cyclo Hexane dimethanol. These third components can be used singly or in combination of two or more.

The PES (I) used in the present invention can further be the same as a polyfunctional carboxylic acid, such as 1,2,4-benzenetriacid, 1,3,5-benzenetriacid, 1,2,4,5-benzenetetraacid Either tricarboxylic acid, or a polyol, such as glycerol, trimethylolethane, trimethylolpropane or pentaerythritol, copolymerized, as long as the resulting polyester is substantially linear.

The content of the compound represented by the formula (1) is from 2 to 20% by mole, preferably from 3 to 18% by mole, based on the dicarboxylic acid component constituting the polyester. If the content is less than 2% by mole, the resultant polyester cannot be made into high-shrinkage fibers expected in the present invention due to insufficient reduction in polyester crystallinity. If the content exceeds 20% by mole, the polymerization reactivity decreases, and the resulting polyester tends to have low crystallinity. In this case, if a polyester having a satisfactory crystallinity is indeed obtained, it has a relatively low melting point, so that the heat resistance of the resulting fiber is not satisfactory.

As the content of this compound increases, the crystallinity and melting point of polyester decrease, while the shrinkage of polyester fiber increases. Therefore, the content of the compound should be appropriately selected within the range specified in the present invention so as to satisfy the required heat resistance, shrinkage retention and dyeability for each end use.

The polyesters used in the present invention can be obtained by any conventional polymerization method. For example, a method can be used which involves direct esterification of terephthalic acid and alkylene glycol. Lower esters of terephthalic acid (such as dimethyl terephthalate) and alkylene glycol The first step of transesterification or the reaction of terephthalic acid with alkylene oxides to form alkylene glycol esters of terephthalic acid and/or oligomers thereof, and the reaction product of the first step in a compound such as antimony trioxide In the presence of a polymerization catalyst such as , germanium oxide or tetraalkoxyethane, the second step is to polycondense to a specified degree of polymerization at a temperature between 230-300 ° C and under reduced pressure. In the above case, the compound represented by the structural formula (1) may be added in a specified amount at any stage up to the end of the polycondensation reaction, for example, added to the starting material of polyester or at a certain stage after transesterification and before polycondensation Time to join.

In order to increase the degree of polymerization, it is also possible to carry out polymerization in liquid phase first, and then carry out solid phase polymerization.

The PES (I) used in the present invention preferably has an intrinsic viscosity of 0.4 to 1.5 (measured at 30°C using a 50/50 by weight phenol/tetrachloroethane mixed solvent). If the intrinsic viscosity of PES(I) is less than 0.4, the resulting fiber will have poor strength and shrinkage properties and cannot achieve the object of the present invention. On the other hand, if the intrinsic viscosity of PES(I) exceeds 1.5, the polyester will have an excessively high melt viscosity, thereby deteriorating fiber-forming properties such as spinnability and drawability.

Under the condition of not hindering the purpose of the present invention, the PES (I) used in the present invention may contain additives such as antioxidants, ultraviolet absorbers, fluorescent whitening agents, matting agents, antistatic agents, and flame retardants as required. , auxiliary flame retardants, lubricants, colorants, plasticizers and inorganic fillers.

The PES fiber (II) of the present invention can be produced by general melt spinning. The as-spun tow obtained is drawn in the usual manner, ie under the drawing conditions usually employed for conventional polyester fibres. Therefore, the as-spun filament bundle is preheated by a hot roll, and then hot-drawn under a draft ratio matched with the speed of the winding roll. Alternatively, a combined spinning-drawing method in which spinning is directly connected to thermal stretching can also be used.

The PES fiber (II) can have any cross-sectional shape, such as round, multi-lobal (including 3-8 lobes), T-shaped, V-shaped, flat or square. The PES fiber (II) does not have to be solid, but can also be hollow or porous. There is no specific limitation on the fineness (thickness) of the PES fiber (II), so it may have any optional fineness according to the intended use. The PES fiber (II) may have denier irregularity along the fiber axis.

PES fiber (II) can not only be made into filament yarn, but also can be made into short fiber.

The PES fiber (II) has a birefringence Δn satisfying the following condition (2).

-5.55×A+80≦Δn×10 ³ ≦−5.55×A+165 (2) wherein A is the content expressed in mol % of the compound represented by the formula (1).

The birefringence Δn value within the above range can achieve excellent polyester fiber dyeability and deep color dyeability during fiber dyeing.

The compound represented by the structural formula (1) is incorporated into the polyester molecular chain so that the alicyclic skeleton of the compound is located on the side chain of the molecular chain. Due to this configuration, even a small amount of the compound increases the degree of amorphous state, suppresses a decrease in the secondary transition temperature, and accumulates stress due to relaxation of the resulting fiber when the fiber is thermally shrunk. Thus, the fiber becomes highly shrinkable while also having excellent heat resistance, color fastness and light fastness. Here, light fastness can be expressed by carbon arc light fastness, and the above-mentioned PES fiber (II) is listed in at least four grades. There are no restrictions on the dyeing conditions of this fiber, and all disperse dyes, cationic dyes and acid dyes can be used to provide any color from light to deep.

The PES fiber (II) of the present invention can be produced not only with high shrinkage rate but also with high shrinkage stress by properly adjusting the drafting conditions.

In general, highly shrinkable fibers exhibit a low shrinkage stress. However, the polyester fibers of the present invention, when drawn under specific conditions, have both high shrinkage and high shrinkage stress.

Specifically, the as-spun tow of this polyester produced by the common melt-spinning process is drawn after being coiled or directly by heating. Preferably, the as-spun tow is preheated to about 75-95°C by heated rolls before being fed into the drafting zone. Next, stretch the preheated tow at a temperature of 150°C or slightly lower, preferably at a temperature of 140°C or slightly lower, at least 0.68 times, preferably at least 0.7 times, the highest breaking elongation ratio. . If the drawing temperature exceeds 150°C, the shrinkage of the resulting tow will decrease. If the draw ratio is less than 0.68 times the maximum draw ratio, the resulting tow will have insufficient shrinkage stress and excessive residual elongation and thus become difficult to form into clothing.

The drawn polyester tow thus obtained (hereinafter referred to as "drawn PES fiber (III)" or "drawn PES filament (III)") has a high shrinkage rate and a high shrinkage stress, that is, at least A dry heat shrinkage of 20% and a maximum dry heat shrinkage stress of at least 250 mg/denier and a wet heat shrinkage of at least 15% at 98°C. Simultaneously satisfying the above three conditions of dry heat shrinkage, maximum dry heat shrinkage stress and wet heat shrinkage, when used as core yarn of sheath-core false twist yarn or as will be described later in this paper, different When used as a component of mixed filament yarn made of shrinkable tow, it can be made into woven or knitted fabrics with good hand feeling. These fabrics, after post-treatment, can have appropriate HARI (stiffness resistance to drape), KOSHI (stiffness) and bulkiness.

If the drawn PES filament (III) having a dry heat shrinkage of less than 20% is used as the core yarn of a sheath-core false twist yarn as described later, the woven or knitted fabric made therefrom will tend to Since the drawn PES filament (III) has insufficient shrinkage, bulkiness is insufficient. Although there is no upper limit to the dry heat shrinkage, it is preferably less than 80%, more preferably between 20-75%, from the viewpoint of deterioration of fiber properties.

The difference between the dry heat shrinkage and the wet heat shrinkage is too large for drawn PES filament (III) with a wet heat shrinkage of less than 15% at 98°C. Woven and knitted fabrics made with such filaments tend to have poor dimensional stability and dimensional uniformity due to excessive shrinkage of the drawn PES filaments (III) during processing e.g. Dry heat treatment such as heat setting after wet heat treatment such as dyeing. Although there is no specific upper limit to the moisture heat shrinkage rate, it is preferably 75% or less, more preferably between 15-70%, which is based on physical property considerations, especially based on the finished product woven or knitted Tendency to collapse. There is also no limitation on the difference between the dry heat shrinkage rate and the wet heat shrinkage rate, but it is preferably in the range of 1-30% for the same reason as above.

The ease with which fibers or woven and knitted fabrics shrink under constrained conditions depends on the shrinkage stresses of the fibers making up the fabric. Even under restrained conditions, the greater the shrinkage stress of the fiber, the easier it is to shrink. Fibers having a maximum dry heat shrinkage stress of at least 250 mg/denier at 180°C are sufficiently shrinkable even under constrained conditions.

Drawing PES filaments (III) can be used to make mixed filament yarns and sheath-core false twist yarns with filaments of different shrinkage.

First, the description applies to mixed filament yarns.

Traditional mixed filament yarns of different shrinkages including polyethylene terephthalate filaments with different shrinkages are used to make spun woven and knitted fabrics with soft handle and drapability, and their main uses are Make women's outerwear and shirts. Such mixed filament yarns are conventionally produced by mixing drawn yarns having different boiling water shrinkages, or by drawing undrawn yarns having the same physical properties under different heating conditions and then mixing them. However, for this process, filaments of different boiling water shrinkage are simply mixed, and the original shrinkage difference is continuously reduced along the heating process up to the weaving or knitting process. In addition, the resulting woven or knitted fabric has poor hand feeling due to the small stress accumulated due to the difference in heat shrinkage under restricted conditions.

Where the drafted PES filament (III) is used as the high-shrinkage filament of the above-mentioned conventional mixed filament yarn of different shrinkage filaments, the above-mentioned problems are solved, and not only that, excellent light fastness is also obtained. degree of benefits.

The mixed filament yarn of different shrinkage filaments according to the present invention comprises the group of highly shrinkable filaments consisting of the above-mentioned drawn PES filaments (III) and consists of filaments with less shrinkage than the drawn PES filaments (III) The low shrinkage filament group, the two groups are mixed together by interlacing or blending. Preferably, the difference between the moisture heat shrinkage at 98°C (hereinafter simply referred to as the moisture heat shrinkage) of the high-shrinkage filament group and the low-shrinkage filament group is at least 8%. If the difference in wet heat shrinkage is less than 8%, the woven or knitted fabric comprising the mixed yarn hardly exhibits sufficient shrinkage properties. However, in order to form a specific structure after the yarn with high-shrinkage filaments in the core and low-shrinkage filaments in the sheath is woven or knitted into a fabric, attention is only focused on the measure of poor wet heat shrinkage. Up is not enough. The synergistic effect produced by the difference in wet heat shrinkage between high shrinkage filaments and low shrinkage filaments and the maximum dry heat shrinkage stress of high shrinkage filaments can achieve sufficient heat loss in the post-processing process of woven or knitted fabrics. Shrinkage performance, so as to obtain excellent hand feeling, including HARI (stiffness resistance to drape), KOSHI (stiffness) and bulkiness.

In order to make the woven or knitted fabric show sufficient heat shrinkage in the post-treatment process, it is better that the difference between the wet heat shrinkage of the high-shrinkage filament and the low-shrinkage filament is between 8-60%, more preferably Well between 10-55%.

It is also preferable that the mixed filament yarns of these different shrinkage filaments have a moisture heat shrinkage rate between 10-55%, especially between 10-50%. If the wet heat shrinkage rate of the mixed yarn is Less than 10%, the finished woven or knitted fabric will have insufficient hand, such as drape resistance, crisp and bulky feel. On the other hand, if the wet heat shrinkage exceeds 55%, the mixed filament yarn will tend to have poor thermal stability.

More preferably, the filaments constituting the high-shrinkage filament group of the mixed filament yarn, i.e. the drawn PES filaments (III), have a monofilament fineness of 1-10 deniers, while the filaments of the low-shrinkage filament group have a density not greater than The monofilament fineness is 5 denier, and the weight ratio of the high-shrinkage filament group and the low-shrinkage filament group is between 2:1 and 1:5, so that the woven or knitted fabric has a good hand feeling. There is no particular limitation on the kind of polymer constituting the low-shrinkage filament group, and any one of polyester, rayon, polyamide and similar filaments, as long as it has a ratio of at least Low 8% wet heat shrinkage, can be used.

For the mixed filament yarn, the difference in filament length between the drawn PES filament (III) and the low shrinkage filament is preferably at least 4%. If the difference is less than 4%, the woven or knitted fabric using the mixed filament yarn will lack good hand feeling such as bulk and softness. The difference has no specific upper limit, but is preferably not more than 30%, and can be adjusted according to the intended use.

This mixed filament yarn can be produced by ordinary blending, mixed drawing, air nozzle interlacing or similar methods, and it can be further subjected to air texturing methods such as intertwining or taslan crimping to improve the yarn The running properties of a thread while processing, weaving or knitting. The mixed filament yarn may have loops or pile.

Next, the application of the drawn PES filament (III) to the sheath-core false twist yarn will be described.

The drawn PES filament (III) is used in the core of the sheath-core false twisted yarn, making it a soft, spun-like false twisted yarn with excellent hand feeling. For this kind of sheath-core false-twisted yarn, it is better to further form filament interlacing points by air intertwining at certain intervals along the yarn direction, so that good bulkiness can be obtained through false twisting and good bulkiness can be obtained during false twisting. Good unwinding performance afterwards. Leather yarn and core yarn are entangled with each other to produce soft false twist yarn with excellent soft hand feeling. According to the intended purpose, the air intermingling can be performed before or after the false twisting, and the false twisting is preferably carried out at a temperature below the melting point of the low melting point filament. False twist number T can be identical with the false twist number of traditional polyester false twist yarn, and is preferably in the scope determined by following formula: $T=\mathrm{To}{\{150/[\mathrm{DX}(R^1/R^2)\left]\right\}}^{\frac{1}{2}}$ R ¹ /R ² =k·r where 1200≤To≤2800: 0.9≤k≤1.4: R ¹ represents the feed roller speed of the feed yarn: and R ² is the exit roller speed; r is R ¹ and R ² The ratio of D is the value used in the manufacture of bulked yarn: and D is the feed yarn denier (denier).

The fineness of the leather yarn and the core yarn should be selected according to the intended use, but generally the leather yarn is better than or equal to the fineness of the core yarn. The sheath used preferably comprises polyester, which may be modified. For this purpose, composite fibers comprising polyester and polyamide can also be used.

The PES(I) of the present invention can be used to produce composite fibers and blended yarns.

First, the fiber used for the composite is introduced.

PES(I), while being combined with other fiber-forming polymers, was formed into a composite fiber, which was then drawn under the above-mentioned drawing conditions. Then, the resulting fiber, relying on this composite structure, produces spontaneous crimping due to the difference in shrinkage of the two components; due to the high shrinkage of PES(I), a fine and compact fiber surface is formed on the surface of the fiber formed by another fiber-forming polymer. wrinkles; or develop effective delamination due to large shrinkage differentials. In this way, this kind of composite fiber has excellent properties similar to natural fiber fabrics, such as good elasticity, drape resistance, crispness, bulkiness, smoothness, suppleness and softness.

Examples of composite configurations are: side-by-side, skin-core, eccentric skin-core, multilayer and radial composites. Any of the above-mentioned configurations may be appropriately selected according to the intended use as long as PES(I) can be made to exhibit high shrinkability.

Traditional crimped composite fibers are side-by-side or eccentric sheath-core type, which contains the following components: polyethylene terephthalate composite fibers with different degrees of polymerization, polyethylene terephthalate and polyethylene terephthalate Butylene phthalate composite fiber, a composite fiber of isophthalic acid and an adduct of polyethylene oxide and bisphenol A, and ethylene terephthalate copolymerized, and similar combinations. However, these conventional conjugated fibers are insufficient in shrinkability, or else they are insufficient in light fastness even if they have sufficient shrinkability. Conjugated fibers comprising PES(I) and other fiber-forming polymers solve the problem of insufficient color fastness and also have sufficient shrinkage properties. Nonwoven fabrics containing such composite fibers are useful due to their good shrinkage properties.

The application in blended yarn is introduced below.

Draw PES fibers (III) and short fibers of other synthetic fibers and/or natural fibers, and blend them into blended yarns by ordinary methods. Woven or knitted fabrics comprising such blended yarns, after heat treatment, develop good bulk, because short fibers made from drawn PES fibers (III) can still be stretched even under the constraints of the woven or knitted tissue shrink fully. These woven or knitted fabrics also exhibit excellent light fastness compared with conventional products and thus have great practical value.

There are no restrictions on the titer, cut length, number of twists and blending ratios of staple fibers made of drawn PES fibers (III) and other synthetic and/or natural fibers for this purpose, and these parameters can be adjusted according to the desired Use is properly determined.

Although composite fibers using PES (I), PES fibers (II) and drawn PES fibers (III), hybrid filament yarn sheath-core false twist yarns and blended yarns have been described, the present invention also includes the use of these fibers of woven and knitted fabrics.

Examples of such fabrics include woven, knitted and non-woven fabrics using the drawn PES fibers (III) as ground yarns or loop yarns. These fabrics preferably contain at least 20% by weight, more preferably at least 30% of drawn PES fibers (III), composite fiber mixed filament yarns, blended yarns or sheath-core false twisted yarns. If the content is less than 20% by weight, the fiber of the present invention will only shrink insufficiently under the constraints of a woven or knitted texture, and thus cannot provide a satisfactory product. Even when satisfactory products are obtained, their drape resistance, crispness, springback or bulk are insufficient, or their dimensional stability is so poor that they will stretch or collapse when placed under external force .

Fabrics containing such high shrinkage fibers do not suffer from the problems inherent in fabrics of conventional similar weaves, such as poor hand and insufficient light fastness. Terry fabrics containing such shrinkable fibers can be imparted with high density and high bulk.

The present invention will be described in further detail below in conjunction with the following examples.

In the following Examples, Comparative Examples and Reference Examples, various properties were measured in accordance with the methods given below.

Content (% (mole)) of the compound represented by formula (I):

Calculated based on the measurement results of ¹ H-NMR (nuclear magnetic resonance) spectrum of a polyester sample dissolved in deuterated trifluoroacetic acid.

Intrinsic viscosity of polyester (dl/g):

Measured at 30°C in a 1:1 (by weight) phenol/tetrachloroethane solvent.

Melting point (°C), glass transition temperature (°C) and crystallinity (J/g) of polyester:

A differential scanning calorimeter (Mettler TA 3000, manufactured by Perkin-Elmer) was used. While continuously replacing the air in the instrument with nitrogen, measure 10 mg of sample at the temperature rising and falling rates of 10°C/min. The same sample is measured twice by this method, and the result of the second measurement is used as the reserved value. The -sample was heat-treated separately until fully crystallized, and then tested in the same equipment to obtain the crystal fusion heat (J/g) as an index of crystallinity.

Birefringence of polyester fibers:

In α-bromonaphthalene, use a sodium vapor light source and insert a Berek compensator in the light path of a polarizing microscope.

Thermal shrinkage rate of polyester fiber dry (Dsr,%):

A length of 50 cm is marked on a sample under an initial load of 1 mg/denier (hereinafter "denier" is sometimes referred to as d). Place the sample in a dry heat atmosphere at 180°C, load 5 mg/d and place it for 10 minutes, then take it out and measure the length Lcm between the marks under a load of 1 mg/d. The calculation method of dry heat shrinkage is:

Dry heat shrinkage (Dsr,%)=[(50-L)/50]×100

Dry heat shrinkage stress of polyester fiber (mg/d):

A 20 cm long filament sample is clamped on a tensiometer (Autograph), and heated at a heating rate of 1 °C/min after applying an initial load of 50 mg/d. The contraction force generated during this heating period is measured.

Wet heat shrinkage rate of polyester fiber (Wsr,%):

Mark a 50 cm long filament sample under an initial load of 1 mg/d. The samples were then placed in hot water at 98°C and loaded with 5 mg/d for 30 minutes. The sample is taken out of the hot water and the distance L'cm between the two marks is measured. The calculation method of wet heat shrinkage is:

Wet heat shrinkage (Wsr,%)=[(50-L')/50]100

Wet heat shrinkage of mixed filament yarn (Wsr', %):

It was measured in the same way as the above-mentioned polyester fiber moisture shrinkage rate.

The difference in wet heat shrinkage rate (ΔW, %) of each fiber constituting the mixed filament yarn:

The mixed filament yarn sample was separated into individual component filament groups, and the boiling water shrinkage of each group was tested as above. Calculate the difference between the measured values.

Fiber length difference (1,%) of the filament group constituting the mixed filament yarn:

A 50 cm length was marked on a filament yarn sample, which was then separated into component filament groups. Measure the distance of each group under the load of 1 mg/d, and record it as l ₁ and l ₂ . Find the difference between l ₁ and l ₂ .

Light fastness:

The cloth samples were dyed according to the following conditions, and then the light fastness of the dyed samples was measured according to JIS L0842-1988.

Staining: Sumikaron Red S-BL 0.1 or 3.0%

(Produced by Jiayou Chemical Company)

Dispersant: Disper TL 1g/l

Myung Sung Chemical Co., Ltd.

PH regulator: acetic acid 0.5CC/L

Dyeing time: 60 minutes

Dyeing temperature: 130℃

Bath ratio: 1:50

Alkaline reduction cleaning

NaOH 1g/l

Amylase (first industry

Pharmaceutical company) 1g/l

Hydrosulfite (the first industry

Pharmaceutical company) 1g/l

Cleaning time 20 minutes

Cleaning temperature 80℃

Bath ratio: 1:50

Color depth of dyed cloth (K/S):

Spectral reflectance (R) of the dyed fabric sample dyed with a dye concentration of 3.0% under the above conditions was measured with a color analyzer (an automatic recording spectrophotometer manufactured by Hitachi). Calculate the shade depth according to the following Kubelka-Munk formula:

K/S=(1-R) ² /2 R where R is the spectral reflectance at the maximum absorption wavelength on the reflectance curve in the visible light range.

Evaluation of fabric handle and elasticity:

The hand feeling represented by the bulkiness, softness, sagging resistance, crispness, silkiness and elasticity of the fabric samples was sensory evaluated by the paired comparison method.

Reference example A

A mixed diol consisting of 4.2 mole percent norbornane-2,3-dimethanol (a compound shown in Table 1) and 95.8 mole percent ethylene glycol, and terephthalic acid, as di A slurry was prepared in a molar ratio of alcohol to terephthalic acid of 1.2:1. The slurry was esterified under pressure (absolute pressure: 2.5 kg/cm ² ) at 250° C. to a conversion rate of 95% to obtain an oligomerized product. Subsequently, 350 ppm of an antimony trioxide catalyst was added to the product, and the oligomer was polycondensed for 1.5 hours under a reduced pressure of 1 torr (absolute pressure) at 280° C. to obtain a polyester with an intrinsic viscosity of 0.70 dl/g. The resulting polyester was extruded through a die into rods, and the rods were cut into cylindrical chips with a diameter of 2.8 mm and a length of 3.2 mm.

The obtained polyester chip was analyzed by NMR spectrum, and it was confirmed to be a polyester having a norbornane-2,3-dimethanol copolymerization component of 5 mole % (based on the total amount of dicarboxylic acid components). The glass transition temperature Tg of the polyester chip is 78°C, the melting point Tm is 241°C, and the heat of fusion of the crystal after crystallization treatment is 36J/g.

Reference Examples B-Q

Repeat the steps of Reference Example A, the difference is that the copolymerization amount of each compound listed in Table 1 is as shown in the table, and a group of slices are obtained. The intrinsic viscosity, Tg, Tm and heat of fusion of crystals were measured for each polyester, and the results are shown in Table 1.

Reference examples a to q:

Reference Example A was repeated except that the intrinsic viscosity of ethylene terephthalate was 0.70 de/g (Reference Example a), and the copolymerization amount of each of the compounds (as shown in Table 2 and Table 3) was Obtain a series of slices as indicated in the table. Intrinsic viscosity, Tg, Tm and heat of fusion of crystals were measured for each polyester. The results are shown in Table 2 and Table 3.

Example 1

The polyester chips obtained in Reference Example A were melted in an extruder and extruded through a 24-hole spinneret with a hole diameter of 0.25 mm at 290 ° C, and then the extruded filaments were fed at a rate of 1,000 m/min. Speed winding. Gained polyester filaments are drawn by 85°C hot rollers and 100°C (instance 1-1) or 120°C (instance 1-2) hot plates at a speed of 500m/min, and spun out 75d/24 multifilaments , the chapter stretching ratio is 3.20 times, which is 0.75 times of the maximum breaking drafting ratio.

The properties of the obtained multifilament are shown in Table 4.

The multifilament, comprising polyester copolymerized with a specific amount of norbornane-2,3-dimethanol, has high dry heat shrinkage rate and wet heat shrinkage rate, and also has high dry heat shrinkage stress.

A terry knitted fabric was produced using this multifilament as a ground yarn, and it was found that the terry knitted fabric had a high pile density and a high-quality surface appearance. The terry knitted fabric was dyed under the above conditions to produce a dyed knitted fabric having low birefringence and thus good depth of shade, and high color fastness up to grade 5.

Comparative example 1

Repeat Example 1, the difference is that the polyethylene terephthalate obtained in Reference Example a is used instead of the polyester obtained in Reference Example A to prepare 75d/24 filament multifilaments.

The properties of the obtained multifilaments were measured and listed in Table 5.

These multifilaments showed the same level of dry heat shrinkage stress as the multifilament obtained in Example 1, but their dry heat shrinkage and wet heat shrinkage were considerably smaller.

A terry knitted fabric was produced using each of the multifilament yarns as the ground yarn, and it was found that the terry knitted fabric had a small pile density and thus did not have a high-quality appearance. This terry knitted fabric was dyed in the same manner as in Example 1. The dyed fabric has a high light fastness of class 5, however its birefringence is high and the shade depth is low.

Examples 2 to 17

75d/24 filament multifilaments were prepared in the same manner as in Example 1, except that the polyester chips obtained in Reference Examples B to Q were used. The properties of the obtained multifilament are shown in Table 4. This multifilament, while having the same level of high thermal shrinkage stress as the multifilament obtained in Reference Example 1, also had high dry heat shrinkage and wet heat shrinkage. Made loop knitted fabric and dyed with this multifilament as ground yarn, method is with example 1. Due to the low birefringence, the dyed fabric exhibits a high depth of shade with sufficient light fastness for greater utility.

Comparative example 2-7

A 75d/24 filament multifilament was produced in the same manner as in Example 1, except that the polyester chips obtained in Reference Examples a to g were used. The properties of the obtained multifilament are shown in Table 5. Although the multifilaments had high heat shrinkage stress to the same degree as Comparative Example 1, they exhibited low dry heat shrinkage and wet heat shrinkage. Pile fabrics made using such multifilament yarns as ground yarns have a low pile density and thus lack a high-quality appearance.

Comparative example 8-13

The polyester chips obtained in Reference Examples h-m were used, and spinning and drawing were performed in the same manner as in Example 1. However, failure to obtain satisfactory drawn multifilaments due to continuous occurrence of end breaks during drawing is rooted in the non-crystalline nature of such polyesters.

Comparative example 14

A 75d/24 filament multifilament was produced in the same manner as in Example 1, except that the polyester chip obtained in Reference Example n was used. The properties of the obtained multifilament are shown in Table 5. Although the multifilaments had approximately the same dry heat shrinkage and wet heat shrinkage as those obtained in Example 1, they exhibited very low dry heat shrinkage stress. The terry fabric made of this silk as the ground yarn cannot shrink sufficiently due to the low shrinkage stress, so it has a very low terry density and thus lacks a high-quality appearance.

Comparative example 15-17

A 75d/24 filament multifilament was produced in the same manner as in Example 1, except that the polyester chips obtained in Reference Examples o-q were used. The properties of the obtained multifilament are shown in Table 5. Although the multifilaments had the same level of dry heat shrinkage, dry heat shrinkage stress, and wet heat shrinkage as the multifilaments obtained in Examples, when knitted fabrics were made and dyed in the same way as in Example 1, they showed It has low light fastness of grade 1-2, so it has no practical value.

Example 18

Adopting an air pressure is 5kg/cm The fluid processing equipment has made the mixed filament yarn with 2 units/inch intertwining point, ^wherein the multifilament obtained in the example 1-1 is the high shrinkage filament group, The multifilaments obtained in Comparative Example 1-2 were used as the low-shrinkage filament group. It was found that the difference in wet heat shrinkage (ΔW, %) between the two filament groups constituting the hybrid yarn was 15%, the wet heat shrinkage (Wsr', %) of the mixed yarn was 20%, and the difference in filament length was 10% .

Twisting the blended yarn thus made to 300 twists/meter, weaving it into cloth with the twisted yarn as warp and weft, and then dyeing and finishing in a general way to make a kind of twill fabric.

The sensory evaluation of this twill fabric was conducted, and according to the standards of bulkiness, softness, drape resistance, crispness and crispness, it was rated as having excellent hand feeling. This kind of fabric also has good color depth and light fastness at the same time.

Comparative example 18

Example 18 was repeated, except that the multifilament obtained in Comparative Example 2-1 was used as the high-shrinkage filament group to prepare a mixed filament yarn. The difference in wet heat shrinkage (ΔW, %) between the two sets of filaments constituting the hybrid yarn was found to be 4%, the wet heat shrinkage (Wsr', %) of the hybrid yarn was 12%, and the difference in filament length was 2%.

A twist of 300 twists/meter is applied to the mixed filament yarn, and the twisted yarn is used as warp and weft yarn, woven into cloth, dyed and finished to make twill cloth.

The obtained twill fabric was subjected to sensory evaluation, and as a result, it had a bad hand, and lacked bulk and softness.

Comparative example 19

Example 18 was repeated except that the multifilament obtained in Comparative Example 16-1 was used as a high-shrinkage filament group to prepare a mixed filament yarn. It was found that the difference in wet heat shrinkage (ΔW, %) between the two filament groups constituting the mixed yarn was 4%, the wet heat shrinkage (Wsr', %) of the mixed yarn was 12%, and the difference in filament length was 2%.

A twist of 300 twists/m is applied to the mixed filament yarn, and the twisted yarn is used as warp and weft yarns to weave into cloth, and dyed and finished by ordinary methods to obtain a kind of twill cloth.

A sensory evaluation of the resulting twill fabric proved to have a bad hand, lack of bulk and softness.

Example 19

The multifilament gained in the example 1-1 is combined as the high shrinkage filament group and the multifilament obtained in the comparative example 1-2 is the low shrinkage filament group to make sheath-core false twisted yarn, then on the fluid processing machine with 5kg The air pressure of /cm ² will combine the intersection points of 2 units/inch on the yarn belt, and false twist the yarn to a twist number of 2000 twists/meter at 180°C.

The thus obtained false-twisted yarn is twisted to 300 twists/m, and the twisted yarn is used as warp and weft yarns to weave a cloth, dyed and finished by an ordinary method to make a twill cloth. The difference in filament length between the core yarn and the sheath yarn of the sheath-core false twist yarn constituting the cloth was 8%.

Sensory evaluation was carried out on the twill fabric obtained in this way, and it was proved to have excellent hand feeling, and the evaluation criteria were: bulkiness, softness, sagging resistance, crispness and crispness. The fabric also has good depth of shade and light fastness.

Comparative example 20

Example 19 was repeated, except that the multifilament obtained in Comparative Example 2-1 was used as the high-shrinkage filament group, and the false twist temperature was changed to 200° C. to produce a sheath-core false twist yarn.

The false twist yarn thus obtained was machine-woven into a twill fabric in the same manner as in Example 19. The difference in filament length between the core yarn and the sheath yarn of the sheath-core false twist yarn constituting the cloth was 2%. Since the difference is small, only 2%, that is, the shrinkage rate of the filament yarn as a high shrinkage filament group is small, so the fabric has a bad hand.

Comparative example 21

Example 19 was repeated, except that the multifilament obtained in Comparative Example 16-1 was used as the high-shrinkage filament group, and the false twist temperature was changed to 200° C. to produce a sheath-core false twist yarn.

The sheath-core false twisted yarn thus obtained was woven into a twill fabric in the same manner as in Example 19. The difference in filament length between the core yarn and the sheath yarn of the sheath-core false twist yarn constituting the cloth was 7%.

Although the hand of this fabric was as good as that of Example 19, the light fastness was extremely poor, only rated 1-2.

Example 20

Composite melt spinning was performed using the polyester chips from Reference Example A and Reference Example a to produce a side-by-side structure to obtain as-spun filaments. Then, the as-spun filaments were drawn in the same manner as in Example 1 to obtain 75d/24 composite multifilaments.

The composite multifilament obtained in this way is subjected to a twist of 300 twists/meter, and then the twisted yarn is used as the warp and weft yarns to weave a cloth, which is dyed and finished by ordinary methods to make a twill cloth.

In the composite multifilaments constituting the resulting cloth, extremely fine spiral crimps are generated during finishing due to the difference in shrinkage properties of the polyester constituting the multifilaments. The obtained cloth has moderate elasticity and bulkiness similar to that of wool fabric, drape resistance, crispness and rebound. Furthermore, the fabric is also excellent in depth of shade and has sufficient light fastness for practical use.

In addition, the above-mentioned side-by-side composite multifilament yarn was cut into short fibers having a length of 51 mm, and formed into a nonwoven fabric. This kind of nonwoven fabric has good elasticity, and its component fibers are curled by heat treatment during processing. The nonwovens exhibit excellent depth of shade and light fastness when dyed.

Comparative example 22

A composite multifilament was produced in the same manner as in Example 20, except that the polyester chips obtained in Reference Example b instead of Reference Example A were used. In the same manner as in Example 20, a twill fabric was prepared from the composite multifilament, and sensory evaluation was performed in the same manner.

The resulting fabric, due to the small difference in shrinkage between the polyesters constituting the fibers, only produces fine curls to a small extent, so it lacks elasticity, bulk, sagging resistance, crispness and rebound.

Comparative example 23

A composite multifilament was produced in the same manner as in Example 20, except that the polyester chips obtained in Reference Example p were used instead of the chips obtained in Reference Example A. In the same manner as in Example 20, a twill fabric was prepared from the composite multifilament, and sensory evaluation was performed in the same manner.

Although the resulting fabric has good elasticity and hand, it exhibits extremely poor light fastness as low as grade 1-2.

Example 21

The composite filament obtained in Example 20 is cut into short fibers of 51 mm and polyethylene terephthalate short fibers with a density of 1 denier and a cut length of 51 mm are mixed in a weight ratio of 50:50 to make a blended yarn . The blended yarn is used as warp and weft to weave cloth, dyed and finished by ordinary methods to make twill cloth.

The resulting cloth has moderate elasticity due to the fine curls generated by heating its constituent composite fibers during processing. Short polyethylene terephthalate fibers are placed on the surface of the fabric to become loops and piles, so the fabric exhibits bulkiness, drape resistance, crispness and resilience similar to wool fabric. The fabric also has good depth of dyeing and light fastness.

Table 1

Table 2

注)EOBPA：双酚A与环氧乙烷的加合物table 3

Note) EOBPA: Adduct of bisphenol A and ethylene oxide

Table 4 example Polyester type Fibrillation Drawing temperature ℃ Fiber properties Birefringence after shrinkage Light fastness grade K/S Dsr% Shrinkage stress Wsr birefringence mg/d % 0.1% 3% 1-12 A good 100120 2724 380380 2417 0.1320.133 0.1170.115 55 4～54～5 18.218.0 2-12 B good 100120 5035 390390 4720 0.1120.114 0.1070.108 55 4～54～5 19.819.5 3-12 C good 100120 6442 380390 5934 0.0950.093 0.0870.083 4～54～5 44 21.120.7 4-12 D. good 100120 2623 390400 2216 0.1240.121 0.1110.113 55 4～54～5 18.918.6 5-12 E. good 100120 4632 400400 4120 0.1030.104 0.0950.093 55 4～54～5 20.520.5 6-12 f good 100120 5437 390400 5130 0.0900.091 0.0820.081 55 4～54～5 21.621.2 7-12 G good 100120 2826 410400 2518 0.1200.119 0.1070.105 55 4～54～5 19.419.2 8-1 h good 100 65 400 60 0.092 0.084 5 4～5 21.0 2 120 33 410 twenty two 0.091 0.085 5 4～5 20.6 9-1 I good 100 73 390 68 0.073 0.065 4 4 22.1 2 120 46 390 40 0.070 0.062 4 4 21.7 10-1 J good 100 twenty four 370 20 0.118 0.109 5 4～5 19.4 2 120 twenty two 380 16 0.118 0.113 5 4～5 19.3 11-12 K good 100120 4128 380380 3521 0.0890.090 0.0820.081 55 4～54～5 20.820.9 12-12 L good 100120 4933 360370 4527 0.0710.070 0.0630.063 4～55 44～5 21.821.6 13-12 m good 100120 2824 430440 2420 0.1340.130 0.1150.117 4～54～5 44 18.518.7 14-12 N good 100120 4637 430430 4025 0.1160.112 0.1090.109 4～54～5 44 19.419.6 15-12 o good 100120 5850 410420 5143 0.0930.095 0.0880.090 44 44 20.620.5 16-12 P good 100120 4736 410420 4230 0.1100.111 0.1010.099 55 44 19.719.9 17-12 Q good 100120 6643 400410 6139 0.0820.080 0.0700.073 4～54～5 44 21.020.7

table 5 comparative example Polyester type Fibrillation Drawing temperature ℃ Fiber properties Birefringence after shrinkage Light fastness grade K/S Dsr% Shrinkage stress Wsr birefringence mg/d % 0.1% 3% 1-12 a good 100120 1715 400410 129 0.1650.166 0.1560.158 55 4～54～5 15.615.8 2-12 b good 100120 1716 400400 1310 0.1560.158 0.1450.148 55 4～54～5 16.116.0 3-12 c good 100120 1715 390400 1310 0.1540.154 0.1420.146 55 4～54～5 16.216.0 4-12 d good 100120 1816 410410 1411 0.1530.156 0.1450.145 35 4～54～5 16.416.4 5-12 e good 100120 1715 390400 1310 0.1560.155 0.1460.147 5 4～54～5 16.316.5 6-12 f good 100120 1816 410420 1311 0.1590.159 0.1510.152 55 4～54～5 15.915.8 7-12 g good 100120 1917 390410 1512 0.1530.154 0.1440.146 55 4～54～5 16.316.2 8 no bad - - - - - - - - - 9 i bad - - - - - - - - - 10 j bad - - - - - - - - - 11 k bad - - - - - - - - - 12 l bad - - - - - - - - - 13 m bad - - - - - - - - - 14-12 no good 100120 2420 210240 1816 0.1420.143 0.1310.134 44 44 17.617.1 15-12 o good 100120 3426 340350 2819 0.1400.141 0.1280.130 11 twenty two 17.917.7 16-12 p good 100120 3124 330330 2718 0.1450.143 0.1310.132 11 twenty two 17.116.9 17-12 q good 100120 3527 340350 3120 0.1300.131 0.1190.122 11 twenty two 18.218.1

Industrial Applicability

The fiber of the invention not only has excellent dyeability and deep color developing ability, but also has high shrinkage rate and shrinkage stress, and excellent light fastness and color fastness. Therefore, whether this fiber is used alone or as a component of blended yarn, sheath-core false twisted yarn or blended yarn, it has high use value. The composite fiber containing the polyester component constituting the fiber of the present invention can produce fine crimps, so the woven fabric has good elasticity.

Claims (2)

1. polyester fiber, it contains a kind of polyester, and it is that main dicarboxylic acids composition and at least a aklylene glycol that is selected from ethylene glycol, trimethylene glycol and 1,4 butanediols are main glycol component that described polyester contains with terephthalic acid (TPA); And

In the dicarboxylic acids composition that constitutes described polyester is base, and content is the compound copolymerization component with structural formula (1) expression of 2-20 mole %

In the formula,

R ₁-R ₁₀Each representative is selected from into ester functional group, hydrogen atom and C ₁-C ₅A base in the alkyl, R ₁-R ₁₀In have one or two to be into ester functional group;

X is 0 or 1;

Y is integer: 1≤x+y≤3 of satisfying following formula,

The birefringence of described polyester fiber meets following condition:

-5.55 * A+80≤Δ n * 10 ³In≤-5.55 * A+165 formula,

The content of A expression (1) compound, this content is represented with mole %.

2. composite fibre, it contains a kind of polyester and another kind of fibre-forming polymer, and its usage ratio is a normal ranges,

Described polyester contains with terephthalic acid (TPA) and is main dicarboxylic acids composition and is selected from ethylene glycol, propylidene ethylene glycol and 1 that at least a aklylene glycol in the 4-butanediol is main glycol component; And,

Become base in the dicarboxylester that constitutes described polyester, content is 2-20 mole %, with the compound copolymerization component of structural formula (1) expression In the formula,

R ₁-R ₁₀Each representative is selected from into ester functional group, hydrogen atom and C ₁-C ₅A base in the alkyl, R ₁-R ₁₀In have one or two to be into ester functional group;

X is 0 or 1;

Y is integer: 1≤x+y≤3 of satisfying following formula,

The birefringence of described polyester fiber meets following condition:

-5.55 * A+80≤Δ n * 10 ³In≤-5.55 * A+165 formula,

The content of A expression (1) compound, this content is represented with mole %.